Geek1945
Well-Known Member
When I had a boat + 2 boys, the fellow at the propeller rebuilding shop mentioned "do you want to cup this prop". Sorry, I don't know what your talking about. He then said it would improve my take-off without downsizing the pitch which it did. I can't remember whether top end WOT changed if it did it must not be by much. It really helped pulling skiers out of the water quicker.
It appears aircraft propellers are flat airfoils. Why won't some slight under-camber give better take-off performance without sacrificing much at cruising speed? Even reducing prop diameter or cord which would lessen the gyro/flywheel effect? Looking at air-boat props it seems that's what they have done, stubby wide cupped props?
Now through the exhaust props also had a bonded rubber coupling/bushing between the shaft and the prop so wouldn't this help with aircraft engine torque pulses when some I/O's are >300HP? So it would seem a 100HP aircraft engine would do better at saving a crankshaft with a similar rubber coupling/bushing? Besides pilots don't suddenly push the throttle, rather slowly making an RPM change.
Would even small coupling/bushing would help on the drive side of a PRSU?
It appears aircraft propellers are flat airfoils. Why won't some slight under-camber give better take-off performance without sacrificing much at cruising speed? Even reducing prop diameter or cord which would lessen the gyro/flywheel effect? Looking at air-boat props it seems that's what they have done, stubby wide cupped props?
Now through the exhaust props also had a bonded rubber coupling/bushing between the shaft and the prop so wouldn't this help with aircraft engine torque pulses when some I/O's are >300HP? So it would seem a 100HP aircraft engine would do better at saving a crankshaft with a similar rubber coupling/bushing? Besides pilots don't suddenly push the throttle, rather slowly making an RPM change.
Would even small coupling/bushing would help on the drive side of a PRSU?
